Robert Muir created LUCENE-6442:
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Summary: Add a mockfs with unpredictable but deterministic file
listing order
Key: LUCENE-6442
URL: https://issues.apache.org/jira/browse/LUCENE-6442
Project: Lucene - Core
Issue Type: Task
Reporter: Robert Muir
Any test that processes with directory listing apis (Directory.listAll(),
DirectoryStream, walkFileTree, etc) and does not sort the results can cause
reproducibility difficulties, because it might e.g. consume from random() in a
different order and so on.
We can instead sort and shuffle in a predictable way per-class based on the
random seed.
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